Modular type indicator



March 5, 1963 H. JAcoBEl., JR., ETAL 3,080,554

MODULAR TYPE INDICATOR 2 Sheets-Sheet 1 Filed Jan. 25, 1961 INVENTORS HERBERT nhcaaa fle rro/swfr Y BY Two/m5 Wulf/vrais March 5, 1963 H. JACOBEL, JR., ETAL 3,080,554

MODULAR TYPE INDICATOR 2 Sheets-Sheet 2 Filed Jan. 25. 1961 Arm/wey United States Patent O 3,080,554 MDULAR TYPE INDICATR Herbert Jacobel, Jr., Anaheim, and Thomas W. Eentges, Grange, Calif., assignors to Marco Industries Company, Anaheim, Caiif., a corporation of Caiifornia Filed Jan. 25, 1961i, Ser. No. 54,85% 9 Claims. (Cl. 346-37@ This invention relates to indicator light units of the modular type. The term modula-r, as used herein refers to a small unit, particularly one with an indicator face of small area, adapted particularly for use in a. multiple array of such units iitted closely to one another in vertical columns or horizontal rows, or both. More specifically, the indicator unit to which we have applied this term is one having a rectangular indicator face which is substantially coextensive in area with the cross sectional area of the indicator light housing, whereby, when a plurality of such units are stacked one upon another in a plurality of vertical tiers arranged side by side, the plurality of indicator faces will collectively present a substantially uninterrupted composite indicator panel on which a large number of separate indicia, arranged in vertical columns and horizontal rows, can be individually displayed by illuminating their respective indicator units.

The invention contemplates the utilization of a miniature light bulb (e.g. a small neon or incandescent bulb) in each of the indicator units for illuminating its respective indicator face; and is directed particularly to the problem of servicing, such as replacement of burned-out bulbs. To this end, a primary object of the invention is to provide a-n indicator light unit having a readily removable indicator face cap normally closing the forward end of the indicator unit housing.

In an earlier modular indicator unit developed experimentaliy, a pusli-in-pull-out indicator cap of rectangular cross section was telescoped into a close-fitting housing of rectangular tubular form and held by a snug friction tit. Due to the tendency of such a cap unit to slide out of the tubular housing under the effect of vibration, the need for a more secure attachment became apparent, and the present invention is aimed at satisfying that need by providing a positive latching means for holding the indicator cap telescoped in the housing in a fixed position with its indicator face lying in a common plane with the indic-ator faces of surrounding units.

A further object of the invention is to provide an indicator unit of the type indicated above, wherein the latching and unlatching of the indicator cap is accomplished by actuation `of the cap itself rather than a separate latch actuator, in order that the composite indicator face presented by the assembled group of individual indicator caps may present a substantially continuous illumina-ble indicator surface, free of any forwardly projecting latchactuator buttons or handles. More specifically, the invention provides a-n arrangement of indicator housing and indicator cap having cooperable means for latching Vone to the other, adapted to be latched and released by pressure applied to the indicator faces of the cap at a designated point.

Other objects and advantages will become apparent in the ensuing specifications and appended drawings, in which:

FIG. l is an exploded view of an indicator unit embodying our invention;

FIG. 2. is a longitudinal axial sectional view of the same;

FIG. 3 is a transverse axial sectional view of the same;

FIG. 4 is a transverse sectional view of the same taken on the line 4-4 of FIG. 3;

FIG. 5 is a front face view of the unit taken as indicated `by the line 5-5 of FIG. 2;

dhaii Patented Mar. 5, i953 ice FIG. 6 is a transverse sectional view taken on the line 6-6 of FIG. 3;

FIG. 7 is a face view of an assembly of our improved modular indicator units;

FIG. 8 is an inverted plan view of said assembly;

FIG. 9 is la sectional view taken on the line -9 of FIG. 3, illustrating the operation of attaching the indicator cap; and

FIG. 1G i-s a sectional view taken on the same plane as FIG. 9 but illustrating the cap in its latched position.

General Description Referring now to the drawings in detail, and in particular to FIGS. 2 and 3, I have shown therein, as an example of one form in which the invention may be embodied, an indicator unit comprising, in general, a housing A of rectangular tubular form including a core il of substantially rigid insulating material such as molded synthetic resin plastic, and a sheet metal jacket 12; a pair of mounting brackets B, fabricated of sheet metal, for mounting the indicator units to one another and to a mounting panel C; a rear end cap D, of molded insulating material (which may be lthe same as that of core 11) fitted into the rear end of core lll; a pair of combined terminal and latch-keeper units E, of metal, fitted between the telescoping portions of housing A and rear end cap D; an indicator cap and light bulb assembly F latched into the forward end of housing A; and a pair of bridge plates G for joining yadjacent indicator units to one another (FIG. 8).

Jacket i2 and core 11 cooperatively provide a housing comprising the core 11 as a rear end portion and a thinwall rectangular sleeve portion projecting forwardly there from to receive the indicator cap F. The latter is received within this sleeve portion of the housing as indicated in FIG. 2, with its indicator face flush with the forward end of the sleeve and fitted snugly therein, In an assembly of several vertical tiers of the indicator units as shown in FIG. 7, the opaque edge Isurfaces of the forward lsleeve portions of the housings will cooperatively define a rectangular grid or lattice framing the individual indicator faces as shown in FIG. 7. The indicator faces of cap units F are of light-transmitting character (preferably translucent).

Detailed Description In housing A, core ll comprises a rectangular tubular forward portion 15 dening a recess t6 to receive the rearward portion of indicator cap unit F; a rear portion 17 providing a rectangular socket to receive the shank of rear end cap D; and a central web portion 1S which has in its center a circular opening 19 establishing communication between the socket I7 and the recess id. In the respective sides of web 18 are a pair of transverse bores 2t) yto receive rivets or bolts 21 for securing the brackets B to the core A, and for securing tiers of the units to one an other, through bridge plates G. Jacket 12 consists of a pair of channels or sleeve sections 25, each having opposed apertures 20 to receive bolts 21 by means of which they are secured in assembly to core 11.

Formed in respective sides of web 13 are longitudinally extending elongated rectangular slots 22 (FIG. 3) each of which is flared outwardly at its rear end to define an offset shoulder 23 at the base of the socket 17. Each slot 22 extends transversely between a pair of elongated lands 24 extending parallel to the major axis of core 11. There is a pair of lands 2d at each side of the core 11 and between each pair there is dened a shallow fiat longitudinally extending recess to receive a portion of unit E.

Bracket B, of stamped sheet metal construction, comprises a sleeve section 25 of rectangular channel form and a bracket part of angle form including a leg 26 secured by welding (or simply by means of rivet 2l) `posite sides of shank 35 are dimples v37.

to one `side of a respective sleeve section 25, a leg 27 in face to Vface contact with the vcentral web ofsleeve section 25; and a tab 2S formed integrally with and bent atright angles from one endjof the leg 27 andoffet rearwardly from the adjacent end of Ysleeve section `25 so as toseat against the rear surface of mountingpanel C as shown in FIG. 2, with a forwardly projecting sleeve portion 25 extending through an aperture :29 in the panel C. T othevrearface of each tab'28 is secured a. locking vnut 3? to receive a mounting screw passed through asuitable aperture inpanel C, for securing-the unitto -the panel.

Rear end .cap vD comprises a shank portion 35 projecting forwardly from a-angedV rectangular head 36 having a periphery matching thatof core A while the periphery of shank 35 i-s such -as to fit snuglywithin socket 17. TheV cross. sectional contour of shank 35 is rectangular, modified to Z-form by L-recesses 35 in diagonally opposite corners thereon (FIG. 1). -In op- Extending through the end capD along the major QXisIheIeOf-is a bore 38 having .a counterbore 39 at. its innerend.

rlvounted inthe 4bore 38 is a tubular terminalbushing 40, which has at its rearend a head 40 .abutting the cap head 39. Through bushing 46 is :extended .aterminal plunger contactV 4l. A terminal tail.42 is.secure d beneath a flanged head 40' onthe rear. end of bushing 4t?. Plunger 41 has at its rear, outer end an outwardly swaged head 4IYand, at its inward,.forward end, a head 43 abutted against'one end of a barrel springdt. The

other end of spring 44 is seated -inthecounterbore 39, against the innerwend of `bushing 40, .which is rireted outwardly againstthebottom of counterbore 39,'at-45. Plunger 41 is slidable axiallyinthe bushingft() yandis urged forwardly by the barrel spring Mythe headdl retaining it in assembly when'the rear end capjunitD is withdrawn from the housing. The headl 43 functions -asga contact. which is yieldingly4 pressed against the rear end of the lamp bulb of indicator cap F, lwith the plunger 41 retracted to the extent that `theheadtl istshown yprojecting-from bushing head 40 vin FIG. 3.

Inone end of thehanged head 36, communicating with the shorterarm of a respective L-recessS,y lying in the plane of said shorter arm, ,and projectingA entirely through the ange ;ofhead 36 parallel to the axis `of bore 39, is a shallow flat passage 46, shown in rphantorn in FIG. l.

Terminallatch keeper unitE comprises, inone instance, aZ-body of stamped ,sheet metal .(e.g. spring'brass) comprising anotset central web 5t) ofangle form, a

latch keeper bar 51 projectingY from one side ofa longer arm of web Sil, andaterminal tail 52 of ,straight bar form projecting Vfrom the opposite side of the Vother V(shorter) arm of web 5t). The arms of web'Stl (and correspondingly, the keeper 1bar 51 and` terminal tail 52.) are disposed in planes at right angles to one .another and are joined by antintegral bendf AOpening Ainto the for ward end of keeper bar 51v is a bayonet slotv53. The

forward tip portions of bar Sl-onl respective, sidesfo-f bayonetslot53 aredihedrally bent, outwardly at a small angle to provide wings` 54 which, inuthejassernbled 4indicator unit as shown in FIG. 3, provide a aringmouth to receiverthe rear portions of indicator cap F.

-Only one of the units E has the terminal tail 52. 'Ijhe other one, shown inthe background in FIG. 1, consists -in a keeper bar 51 and the angle web 50 without a tail.

In the assembled unit, the angular webs 50 of the vterminal-keeper units E are received in the L-recesses 35' in lsl' 1ar1l-: a5 of rear end cap 1),. theterrninal tailSZ lextends rearwardly through the passaged in the flanged head 36 of rear end cap D, and the keeper b ars 51 c project forwardly through the.apertures 22 inthe central web 18 of the core A. The keeper bars 51 are joined `integrally to-their respective webs '50 by shoulder "offsets ,155 whichseat against the shoulders 23 of web 118 Vto brace and position the units E in assembly. The keeper bars -51 are laterally positioned between-therelongated lands 24 of core A and disposed in the recesses defined there between. The terminal-keeper units E are secured in assembly by engagement of their L-webs 50 in the L-recesses 35- between the at walls of the latter and the opposed inner walls of socket 17, as illustrated -in FIGS. 2 land 3. The depth of recesses 35 islsuchpas to provide a snuglit. 'Ihejkeeperubars,SLarepreformed so that their winged tips. 54 will bear against the inner Walls of sleeve member 15. Secure longitudinal positioning of socket unitsE is provided for by the snug bearingV` of offsets 55 against shoulderswwhile'the-rear ends of L-webs 5t) are seated snugly against. 4the-shoulkdered forward 'face of vflanged head '36.

YiorrnedinY the longer arms of- L-webs'50 are punched 4nibs` 56 which project inwardly and engage Ain thedimples 37` in the respective sides of the =sha nk 35 of vrear end cap -'D. The nibs 156 assistthe shoulders y*5S-in retainingthe keeper` bars 5l longitudinally against the pull of l the parts Ythat are latched intojthe bayonet slots-53.

,'Bayonetjslots 53 have at their' inner extremities, keeper notches positioned to receive latch lugs 66 of indicator capy F lso as to retain the cap F in a position in which its .indicatorV face is'flush with'the outer end of housfng sleevejZS, asrshown irr'lIG; 2. These keeper notches are defined by overhanging keeper jaws 57 against which the lugs66 are engagedrunder the spring loading transmitted )by barrel spring 44.

,Indicator cap unit F comprises a lamp s0cket'60 of metalvconsistingin a central -sleeve portiong61having a frusto-pyramidal head 62 at its outer end, a square integral collar, 63 adjoining head 62l and a square collar shown inanopen condition prior to assembly. "Ihevlatch platem65-hjas a round central openingthrough which the rearwardly projecting portion of socket sleeve 61 extends. A srnall lamp bulb (eg.` neonv or incandescent5 bulb) :68 is received in the socketvei), and hasa base Contact `in the yform Vof a ange 69 engaged against therear end of, socket sleeve, 6l. Electrical connectionis thus es-4 ,tablished from the base contact,through` lthe socketn60 and latch plate k,65 and lugs ,66 thereof. tothe keepel bars 51. From the terminalunitE which hasmthe ter- Vrninal tail 52 this side of thecircuit is carried to an external wiring connection.

,The bulb 68 has a centralcontact'vltl (FIG. 3), which seats against the head 43 ofl the, spring mounted terminal plunger 41. External connection to this side vof the lamp is provided vfor by the terminal tail 42`ywhich is electrically lconnected,,through bushingl 40.to the plunger w41.

Molded onto the sockethead 62xismalens`cap v71 having aucentral aperture 72 to receive theforward endof Vlightcbulb 68 and having aforw-ardly extending, pyramidally, flaring skirt 73. A face plate or window 74, havingva'suitable designatingV character 75 (which may be .of opaque material) imprinted thereon. or inlaid therein and having at one end a dot 76 similarly applied, is

secured to skirt 73. The lens plate 74 is of. light-transmitting character, preferably translucent. Alternatively, it could be transparent, or of opaque material with the 'character `7S formed as an aperture therein. A suitably heat resistant plastic material, such as ycellulose acetate butyrate (eg. Tenite I -I-3high temperaturety'pe, which has the required optical clarity) is preferably'used. Lens -cap 71,-likew1ise may be of translucentmolded .plastic material, "and is preferably of a ,plastic material similar chemically Ato that of window 74so that the latterfmay be -secured tothe cap adhesively by the wellkno'wn technique of applying a `solvent to-fthesurfaces to be adhered. The marginal areas of the rear face of lens plate 74 are thus secured adhesively to the forward face of lens cap skirt 73.

Operation In operation, the assembled unit will function as a simple indicator light, with current supplied to the light bulb 63 through the terminals 42 and 52 and the internal connections hereinbefore described.

To remove the indicator cap F, as for replacement of a burned out bulb 68, pressure of a finger tip (indicated at Sti in FIG. 2) is applied to that end of the face plate "/'4 which is designated by the dot 76. Under such pressure, the cap F Will be slightly depressed against the spring 44, releasing 'the frictional engagement between lugs 66 and the overhanging shoulders of jaws 57. The spring pressure, applied along the axis of plunger 41, will react against lthe finger tip pressure applied through cap F along an axis extending between dot 76 and the point of contact of the rear end of lamp 68 against the head 44 of plunger 41, which latter axis, indicated in FIG. 2 by the broken line Si, subtends an obtuse angle to the axis of plunger 41, and there will be a resultant force applied to lugs 66 in the transverse direction (approximately bisecting the obtuse angle between the axes of the applied forces) such as to move the lugs 66 laterally out of the keeper notches into the ope-n throats of bayonet slots 53, and past the tips of jaws S7. The lugs 66 are then freed so as to be released outwardly through the open throats of bayonet slots 53 by releasing the finger tip pressure at dot 76, and by inverting the unit cap F can be dropped out of the open end of the sleeve 25.

To replace the cap F, it is tilted to a position approximately as shown in FIG. 9, where lugs 66 are lined up with the open throats of bayonet slots 53, and is inserted into the open end of sleeve 25 until the lugs 66 are received in the bayonet yslots in approximately the positions shown in FIG. 9. It may be noted that, in this position of the -cap unit F, the center contact Vof lamp 68 will engage against the plunger head 43 near the periphery thereof. Pressure is then applied to the outwardly projected end of cap unit F approximately as indicated by the arrow 82, slightly depressing the plunger 41 and moving the lugs 66 into the bottoms of the bayonet slots 53. The transverse component of pressure 82 will cause the lugs 66 to engage against the ends of keeper jaws 5'7 and slide downwardly against the end surf-aces thereof until the lugs can enter the keeper notches at the bottoms yof the bayonet slots 53, whereupon the cap unit F will tilt 'to a position in which its major axis is aligned with the axis of plunger 41 and the lugs 66 are received in the keeper notches. The movements of the lugs during this operation are indicated approximately by the arcuate arrow S4 in FIG. 9.

Upon release of pressure against the cap F, the lugs 66 will be spring loaded against the under shoulders of -jaws 57 to retain the cap securely latched in the sleeve 25.

FIGS. 7 and 8 illustrate how a plurality of vertical tiers of the indicator units can be attached to one another by the bridge plate G, secured to the tops and bottoms of `the tiers in overlapping or bridging relation to adjacent tiers, by means of the bolts or rivets 21 extended through the bores 2t) of the respective indicator units, with the units arranged in horizontal rows, side by side, as Well as in the vertical tiers. The vertical tiers are secured to one another against horizontal separation by the bridging action of the plates G. The horizontal rows are secured to one another against vertical separation by the long bolts or rivets 21 which extend full length vertically from top to bottom of the `assembly as indicated in dotted lines in FIG. 7, in the leftward tier thereof. The mounting bracket parts 2.628 are secured to the four corners of the rectangular assembly of units, for mounting the assembly to the panel C, with the forward end of the assembly projecting into an aperture 29' of appropriate size in the panel C. FIG. 2 illustrates the mounting of only a single unit projecting into an aperture 4of single uni't size in a panel, which may be desirable in some instances.

Although the indicator faces of cap units F may for some uses be square, the face area (and, correspondingly, the cross-section) of cap unit F for most applications, will be of elongated rectangular form, with the minor crossasectional axis being parallel Ito the common transverse axis of latch lugs 66, and with the major crosssectional axis of the indicator face extending through dot 76, normal to such minor axis. The direction of swinging movement of lugs 66 in their l-atching and unlatching movements is generally parallel to such major crosssectional axis.

We claim:

1. In an indicator light, in combination: a housing 4including a sleeve dening an openable end thereof; an indicator cap and lamp assembly including a cap of non-circular cross-section normally receivable within said sleeve in a position closing said openable end, said cap having a front face, normally disposed at right angles to the longitudinal axis of said housing, for displaying indicia, and having a lamp socket in the back thereof, on an axis normal to said front face, for holding a lamp bulb having an end contact; a spring loaded contact mounted in said housing on said longitudinal axis for engagement by said end contact; said cap having releasable latching means comprising a pair of latch lugs projecting laterally from respective sides of said cap on a common transverse axis and a pair of spaced parallel keeper members mounted in said housing on opposite sides thereof so as to define between them a socket space to receive said lamp socket, said keeper members being provided with respective bayonet slots having at their inner extremities, keeper notches extending in a common direction transversely of said common transverse axis to receive said lugs so as to retain said cap assembly in said normal closing position, said bayonet slots having open throats extending parallel to said longitudinal axis facing toward the said openable end of the housing and offset laterally from the common transverse axis of said lugs when said cap unit is in said normal closing position, whereby release of said lugs from said bayonet slots is accomplished by pressure on said indicator face near a marginal extremity thereof which is on the opposite side of said common transverse axis from said throats, said pressure reacting with the opposing pressure of said springloaded contact along respective pressure paths intersecting at an obtuse angle less than at the point of engagement of said contacts, to develop a transverse resultant of force in a direction toward said throats, effective to tilt said cap assembly on a transverse axis parallel to the said common transverse axis of the lugs, whereby to shift said lugs transversely into said throats to release the cap for removal from the housing.

2. An indicator light as defined in claim 1, wherein said lamp socket comprises a metallic sleeve adapted to establish electrical connection from a lateral contact of a lamp mounted therein, through one of said lugs and its coacting keeper member to one side of an electrical energizing circuit while connection is established through said end contact and spring loaded contact to the other side of such circuit.

3. An indicator light as defined in claim 2, wherein said cap is of plastic material molded onto the outer end of said lamp socket sleeve and has a translucent face plate covering its front side and carrying said indicia.

4. In an indicator light, in combination: a housing including a sleeve of rectangular cross section dening an openable end thereof; an indicator cap assembly of T- form including an elongated cap of rectangular periphery fitted within said sleeve, having a transverse axis of tilting movement normal to the longitudinal axis of the housing and having an indicator face normally disposed a.position:closingr said openable .end .of saidf housing, .ands aetubul-ar-.socket.projectingfrom the .back of .said .capaoni an .axis normal. to,..said end face, for holding a lamp bulb having an end contact; a spring loaded contact .'mountedr-insaid. housingfor .engagement by said en'd contact; and releasable vlatching means comprising a pair of latch lugsls-projecting laterally from respective sides of said/pap parallel to ysaid -transverse laxis and a pair .ofkeepermembers.mountedin said housing on opposite sides inespaced-parallel planes normal to said transverse *,axisso las to.-denebetweenthem .a socket .space toreceive said. flar`r1p-$ocket,. said keeper. members. being `provided withrespective.bayonetslots having atl their inner extremities, keeper notchesextending in.a.cornmon direction transversely with reference to said axis of tilting movement, to receive said lugs so as to retain said .cap assembly insaid.pnormal...closing position `with said end ,facenormaL to .saidlongitudinal axis.. thereof, and .said slots havingthroats opening .toward thesaid openableend ;of-the housing and oisetlate'rallyfrom thecornrnon transverse axis `oiisaid lugswhen. said .cap unit -is in said normal closing position,I whereby. releaseof said lugs. from said .bayonet'slots is 'accomplished by pressure on that end of `svaidfindicator-face which is...on the oppositefside of said common transverse axis .from..,said throats, said pressureH reacting-with vthe Vopposing pressurev of` said spring loaded contact along-respective..pressurevpathsintersecting at an obtuse; angle less` than. 180? at .the .point .of engagement Lof; said. contacts,y to` develop .a Vtransversely directed resultantof force effective. toftilt .said cap unit about said transversenaxis of tiltingfmovement whereby to shift said lugs along..-saidkeeper..notchesy into s'aidthroats -to re- 1 lease the cap `for. removalfrom the housing.

5. In .an-indicator.` light,.,in.combination: a housing including a.-.sleeve of-elongated cross section transversely `rof-:itsvloijigitudinal:axis,:.deir1ing.an, openable end thereof; an indicator capl assembly..A including an. elongated cap goff molded plastic Vmaterialflittedv within. said sleeve with lits major.- .axis normal..to the said longitudinal housing -axisin anormal.closedpositionof said cap, and having atranslucent lens .plateprovidingan indicator face disposedas the end faceof said housing, and aftubular. metal socket havinga forward endmolded into ,the back of said cap-.and arear .end portion-projecting rearwardly `therefromv with: its. .axis .normal to said. end face, forV .holding y a lampbulb .ha-ving anfendcontact said socket having a g pair of lugs projecting from. opposite sides .thereof trans- .,verselyof saidmajoncapaxis .on a. common. axis interl sectingand normal .to-said socket axis; a. spring-loaded contactirnountedyin said-housing for.` engagementby. said .end contact;and` a pair ofy substantially."y iiat Akeeper mem- I bers'mounted in-saidihousing on opposite sidesthereof in ,planes-parallel .-toathe f longitudinal .housing axis and Y parallel-.to said major. ax-is. of .the cap. in. the closed .position .ithereof,.said keeper. members dening..between them a socket space to receive said..projecting rearend portion tofthe lamp-socketswith; said lugs. intersecting saidplanes; .v said `keeperniembers being provid'e`cl..with` .respective bayonet slots having, at their inner extremities, keeper notches to receiverrsaidtlngs soaasfto retain. said cap assembly vwin anormal position closingnsaidopenable end. of the housing, with: .said .endl face .-normaly vto said` longitudinal .axis thereof,-.and said:V slots` havingopen throats facing toward the said openable end of the housingv and offset laterally from the ycommon-transverse axisi of .said lugs when said cap unit-,.is. .in.said.-normalaclosing position, y whereby. releaseofsaid Ilugsfrom said bayonetslots is accomplished-by pressure .on that endof said. indicator face .,whichiseon thetopposite, side of .said common `.transverse axis: from said throats.

r.6. In.anvindicatorlightgtint combination: ahousing ,1 includingl agsleeveof elongated. cross-sectionhaving a 1 Vmajor axissnormattoithe,longitudinallaxisof the housing, s defining an openable. end i thereof; an indicator cap :assemblyiincludingan elongated capA received within. said .sleeve with itsA majorf axisnormalto` said longitudinal .axis in anormal .closed position of said cap, .and having an indicator facedisposed as the end. face of. said housing, and a tubular metal socketfhafving a forward end se- 5 cured to the back of said cap and communicating with the interiory thereof, and-a rear end portion projecting -rearwardly therefrom-With its axis normal to said. end face, -for-holdinga llamp bulb having an end contact; said socket having a pair of lugs-projec`:ting'fromy opposite sidesthereofon a common axis-transverse of said major cap axis; aspring-loaded contact mounted-in said-housing vfor engagement by said lend Contact; and a pair of substantially ilat keeper members mounted inty said housing .ion opposite -sides lthereof in planesV parallelv to the vsaid ,M major axis'of-fthe cap-in .the closed positiorilthereof, said @keeperrnembersdening Ybetween lthem a socket-'space to receivesaid .lamp-socket -with the common axis of saidlugs extending transversely between said keeper mem- :bers; vsaid keeper members having respective keeper ,20 -rneans interengaging vWith said `lugs to latchsaid cap -l.assembly in-said11.ormal closed position-thereof,. said keeper "means being =arranged for -release of said l-lu'gs Vupon swinging `movementl of vsaid `cap assembly uwherein said lugs -move transversely of said housing in-a directionV vgenerally Vparallel to-said major. crosssectionalf axis-thereof, whereby said vrelease is accom- '-plished by applying linger Itip pressure `to vsaidindicator .face -nearvan end thereof which is on the oppositesideof said common lugv axis from the side toward `which-said lugs move in their said releasing movement.

7. Inl an indicator light,'in combination: a housing-including a core of insulating material of rectangular cross "section having forwardv and rear end portions of tubular form and a transverse -central web between said end por- .35 V-tions,said-Webhaving a central aperture and a pair of lateral slots'extending axially-therethrough on opposite Hsides of said aperture, and a pair-of 'sleeve sections of -metalxchann'elsection jointlyconstituting a jacket' surrounding said core andV projecting beyond Atheforward 40 zend portion thereof tovprovide a sleeve of elongated crosssection fdeiningl an openabley front end of said housing; tan indicator capl assembly ofT-form inclulding-a c ap `of elongated'cross-section'tted withinI said sleeve with yits major and minor axes normal to the longitudinal axis V4,5 lfof'the' housing and having an indicator face disposed as the end'face offsaid housing, and atubular socket pro- -ljecting'from thel back of said cap on an axis normal to-said end Iface into the tubular forward end portion of 'saidcore, for holdingl a lamp having an end contact; a rear end cap of insulating material having a shank -received inthe rear. end portion of said core; a spring- V.loaded contactpplunger mounted in said rear end cap for sliding ymovement on. said longitudinal housing axis and projecting through said central aperture'of the web ...55 `into-'said forward end portion of the core; for engagement by said'lamp end contact; andreleasable latchingmeans comprising a pair of latch elements on respective sides of said lamp socket on a common transverse axis parallel -to said minor axis of the indicator cap,fand a pair of keeperbarsmounted in said housing lbetween respective sides of said shank and said rearend portion ofthe core 'and projecting through said lateral slots in embracing `relation to said lamp socket with said sides of the lamp socket in adjacent face-to-face opposition to said keeper -5ifbars,;`said. keeper bars .being provided with respective latch members arranged to receive said latch elementsas to retain said-indicator cap in a normal position closing 1 said-,openable end of the housing, with said indicator face normal to said longitudinaly axis thereof, release of said ,7() latch elements from said latchy members being accom- 4plished bypressure on an end of said'indicator face on .one..side.of. said minor indicator cap axis, said pressure ,reactingwiththe Opposing pressure of. said spring-loaded .contact v`to develop a -transversely directedresultant .of force 4elfective to. tilt said'indicator cap so as to -shift said latch elements generally parallel to said major axis of the indicator cap, to effect said release.

8. In an indicator light, in combination: a housing including a core of insulating material of rectangular cross section having forward and rear end portions of rectangular tubular form and a transverse central web between said end portions, said web having a central aperture and a pair of lateral slots extending axially therethrough on opposite sides of said aperture, and a pair of sleeve sections of rectangular metal channel section jointly constituting a jacket surrounding said core and projecting beyond the forward end portion thereof to provide a Sleeve of rectangular cross-section defining an openable front end of said housing; an indicator cap assembly of T-form including a cap of rectangular cross-section fitted within said sleeve with its major and minor axes normal to the longitudinal axis of the housing and having an indicator face disposed as the end face of said housing, and a tubular socket projecting from the back of said cap on an axis normal to said end face into the tubular forward end portion of said core, for holding a lamp having an end contact; a rear end cap of insulating material having a rectangular shank received in the rear end portion of said core; a spring-loaded Contact plunger mounted in said rear end cap for sliding movement on said longitudinal housing axis and projecting through said central aperture of the web into said forward end portion of the core, for

engagement by said lamp end contact; a pair of keeper bars mounted in said housing between respective sides of said shank and said rear end portion of the core and projecting through said lateral slots in embracing relation to said lamp socket with said sides of the lamp socket in adjacent facetoface opposition to said keeper bars, said lamp socket having means releasably engageable with said keeper bars to retain said indicator cap assembly in a normal position closing said openable end of the housing, with said indicator face normal to said longitudinal axis thereof.

9. An indicator light as defined in claim 8, wherein said rear end cap has a head comprising a radial flange on its rear end, said ange having a slot extending axially therethrough at one side thereof; and further including a terminal tail projecting through said flange slots and an L-web joining said tail to one of said keeper bars and retained between a corner of said shank and an opposed corner of the internal wall of said rear end portion of the core, said tail and its respective keeper bar being thus disposed in planes defining a right dihedral angle.

References Cited in the tile of this patent UNITED STATES PATENTS 2,677,124 Hallerberg et al Apr. 27, 1954 2,825,896 Scheliman et al Mar. 4, 1958 2,925,592 Noyes Feb. 16, 1960 

1. IN AN INDICATOR LIGHT, IN COMBINATION: A HOUSING INCLUDING A SLEEVE DEFINING AN OPENABLE END THEREOF; AN INDICATOR CAP AND LAMP ASSEMBLY INCLUDING A CAP OF NON-CIRCULAR CROSS-SECTION NORMALLY RECEIVABLE WITHIN SAID SLEEVE IN A POSITION CLOSING SAID OPENABLE END, SAID CAP HAVING A FRONT FACE, NORMALLY DISPOSED AT RIGHT ANGLES TO THE LONGITUDINAL AXIS OF SAID HOUSING, FOR DISPLAYING INDICIA, AND HAVING A LAMP SOCKET IN THE BACK THEREOF, ON AN AXIS NORMAL TO SAID FRONT FACE, FOR HOLDING A LAMP BULB HAVING AN END CONTACT; A SPRING LOADED CONTACT MOUNTED IN SAID HOUSING ON SAID LONGITUDINAL AXIS FOR ENGAGEMENT BY SAID END CONTACT; SAID CAP HAVING RELEASABLE LATCHING MEANS COMPRISING A PAIR OF LATCH LUGS PROJECTING LATERALLY FROM RESPECTIVE SIDES OF SAID CAP ON A COMMON TRANSVERSE AXIS AND A PAIR OF SPACED PARALLEL KEEPER MEMBERS MOUNTED IN SAID HOUSING ON OPPOSITE SIDES THEREOF SO AS TO DEFINE BETWEEN THEM A SOCKET SPACE TO RECEIVE SAID LAMP SOCKET, SAID KEEPER MEMBERS BEING PROVIDED WITH RESPECTIVE BAYONET SLOTS HAVING AT THEIR INNER EXTREMITIES, KEEPER NOTCHES EXTENDING IN A COMMON DIRECTION TRANSVERSELY OF SAID COMMON TRANSVERSE AXIS TO RECEIVE SAID LUGS SO AS TO RETAIN SAID CAP ASSEMBLY IN SAID NORMAL CLOSING POSITION, SAID BAYONET SLOTS HAVING OPEN THROATS EXTENDING PARALLEL TO SAID LONGITUDINAL AXIS FACING 